JPH0685278U - Insulation box incorporating window material - Google Patents

Abstract

(57) [Abstract] [Purpose] A window material with heat insulation performance is installed in the heat insulation box so that the inside condition can be observed directly from the outside. [Structure] A window material in which a monolithic silica airgel molded heat insulator is housed in a container formed by using transparent plate materials on at least upper and lower surfaces is incorporated into a heat insulating box. [Effect] It is possible to provide a heat insulating box that can observe the inside directly from the outside and has excellent heat insulating performance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat insulation box that keeps heat inside or cools such as a constant temperature bath, a cooler box, or a refrigerator.

[0002]

[Prior art]

 In a heat insulation box such as a thermostat, cooler box, or refrigerator, which is used for heat insulation and cold insulation, there is a desire to observe the internal condition directly from the outside. It is conceivable to observe the inside of the heat insulation box from this, and for that purpose it is possible to attach double glazing or double glazing such as triple glazing, or a heat insulating material with glass or transparent synthetic resin plates laminated with spacers It has been put to practical use.

[0003]

[Problems to be solved by the device]

 However, it is known that the above-described structure does not have sufficient heat insulation performance, and particularly at low temperatures, the heat insulation performance deteriorates due to convection inside the heat insulation body.

Therefore, when the heat insulator having the above structure is used as a peep window at a low temperature, it is pointed out that frost or dew is generated on the surface of the peep window due to its poor heat insulation performance, and the sight of the peep window is easily obstructed. ing.

[0005]

[The purpose of the device]

 The present invention has been made in view of these circumstances and intends to address the problem.By using a transparent porous monolithic silica airgel molded body having excellent heat insulation performance as a window material, the drawbacks of the conventional structure are eliminated. It aims to provide an adiabatic box with excellent internal observation performance.

[0006]

[Key points of the device]

 The main point of the present invention is to incorporate a transparent structure, in which a monolithic silica airgel molded body is housed in an airtight container having at least upper and lower surfaces formed of transparent plate materials, into a heat insulating box as a window material.

[0007]

【Example】

 Hereinafter, some embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a case in which a transparent heat insulator 1 serving as a viewing window is incorporated into a side surface of a heat insulating box 2, and FIG. 2 shows a transparent heat insulator 1 serving as a viewing window in a door 3 of a heat insulating box 2. It shows the case where it is attached to the surface.

The heat insulating body 1 serving as a viewing window is a container having waterproof and moisture-proof properties so as not to impair the property (visibility as a viewing window) of the monolithic silica airgel molded body 12 which is a transparent heat insulating material. It is housed in 11 and integrated.

The side surface of the container 11 is made of a thin metal plate such as stainless steel or aluminum, or synthetic resin plates 11a and 11a having a low thermal conductivity so as not to form a thermal short circuit. A transparent synthetic resin plate 11b, 11b such as a glass plate, a polycarbonate plate having a low water vapor transmission rate, or an acrylic plate is used for this. It should be noted that the container 11 is not limited to the prismatic shape shown in the drawing, but may be a cylindrical shape.

Glass vapor deposition or the like is suitable as a means for reducing the water vapor permeability of the transparent synthetic resin plates 11b, 11b used on the upper and lower surfaces of the container 11. The connection between the side surface of the container 11 and the transparent glass plate or synthetic resin plate on the upper and lower surfaces has a waterproof and moisture-proof structure by a method such as packing, an adhesive, or welding.

The heat insulator 1 has a structure in which the monolithic silica airgel molded body 12 is housed in the container 11 and then the gas in the container 11 is evacuated from the opening provided in the container 11 and then the opening is sealed. It is also possible to do so.

A polymer liquid crystal light control sheet glass plate is used as the plate material 11b on the upper surface of the container 11 (outside of the heat insulating structure), or a polymer liquid crystal light control sheet film is formed inside the container 11 by monolithic silica airgel molding. By accommodating and integrating with the body 12, the transparency of the heat insulating body 1 can be limited only when necessary.

In addition, as an example of utilizing the transparency of the heat insulating body 1, heat insulation can be easily performed by combining a reversible temperature indicating material (paint or label) with the plate material 11b on the lower surface of the container 11 (inside the heat insulating structure). An example is a structure that allows temperature control within the structure.

The heat insulating material and monolithic silica airgel used in the present invention are silica particles having a diameter of several nm obtained by supercritically drying a wet gel body “silica alcogel” obtained by hydrolyzing and polycondensing alkoxysilane. It is an inorganic porous body composed of.

[0016] Silica particles have no absorber in the visible light region and the particles are considerably smaller than the wavelength of visible light (3800 to 7600Å), so almost no light scattering occurs and most of the light is transmitted. Monolithic silica airgel is transparent.

However, since the light transmittance is considerably high even in the infrared region, particularly at a high temperature of 100 ° C. or higher, heat conduction due to radiation is large and the heat insulating property is deteriorated.

Further, since the pore diameter of the monolithic silica airgel is equal to or less than the mean free path of gas, the thermal conductivity at room temperature is about 0.017 Kcal / mh ° C (mean temperature 27 °) with a specific gravity of 0.14, for example, It has a value below static air (approximately 0.0222 Kcal / mh °).

Further, since a foaming agent such as a specific CFC is not used in the production, a temperature inflection point of thermal conductivity, which is seen in a polyurethane foam using such a foaming agent, does not occur, and particularly in a low temperature atmosphere. It is expected that the insulation performance will be better than that of polyurethane foam using specific CFCs.

On the other hand, under heat and pressure conditions, since the pore size of the monolithic silica airgel is small, heat conduction due to gas becomes negligible, and the heat conductivity is almost the same as that under vacuum at a certain pressure or less. .

That is, the heat insulation performance improved by evacuating the internal gas of the heat insulator 1 does not rapidly liquefy even if the container 11 is slightly leaked.

[0022]

[Effect of device]

 The effects of the present invention are as follows.

(1) The monolithic silica aerogel used for the transparent heat insulator 1 that serves as a viewing window is a porous body having an ultrafine structure, and the structure thus constructed has a thermal conductivity equal to or lower than that of still air. It is possible to configure an internal observation section (viewing window) that has the same or better thermal insulation performance than other general thermal insulation structure parts.

(2) Although the performance of monolithic silica airgel is likely to deteriorate due to water absorption and moisture absorption, in the present invention, by containing the monolithic silica airgel molded body 12 in the container 11 that is waterproof and moisture proof. It has the advantage that performance deterioration can be prevented and excellent heat insulation performance can be exhibited for a long period of time.

(3) The monolithic silica airgel used for the heat insulator 1 is a lightweight body composed of fine particles of silica and therefore easily damaged by impact or the like, but is housed in the container 11 having relatively excellent strength. This can prevent damage.

(4) Since the thermal conductivity of the monolithic silica airgel is almost the same as the value under the vacuum condition at a certain pressure or less, the heat insulation performance of the heat insulator 1 is improved by evacuating the air in the container 11. It is possible to improve and maintain its performance for a long time.

(5) The transparency of the heat insulator 1 is controlled by using a polymer liquid crystal light control material (polymer liquid crystal light control sheet glass or polymer liquid crystal light control sheet film) in the observation portion of the container 11. It becomes possible (blind function).

(6) By combining a part of the container 11 with a reversible temperature indicating material, temperature control inside the adiabatic box can be easily performed visually.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure in which a transparent heat insulating material is attached to a side surface of a heat insulating box.

FIG. 2 is a perspective view showing a structure in which a transparent heat insulating material is attached to the door surface of the heat insulating box.

FIG. 3 is an enlarged cross-sectional view of a transparent heat insulator that serves as a viewing window.

FIG. 4 is a cross-sectional view showing an example in which a polymer liquid crystal light control sheet glass plate is used as part of the container.

FIG. 5 is a cross-sectional view showing an example in which a temperature indicating label is attached to the inner surface of the heat insulating box.

[Explanation of symbols]

 1 Transparent heat insulator that serves as a viewing window 2 Heat insulation box 3 Door 4 General heat insulation part 11 Volume 12 Monolithic silica airgel molding 13 Polymer liquid crystal light control sheet Glass plate 14 Temperature label

Claims (4)

[Scope of utility model registration request] 1. A monolithic silica airgel molded body,
An insulating box that incorporates a window material that is housed and integrated inside a container that uses transparent plate materials on at least the upper and lower surfaces. 2. The heat insulation box according to claim 1, wherein the gas inside the container containing the monolithic silica airgel molded body is evacuated and then the opening is sealed. 3. The heat insulation box according to claim 1, wherein a high molecular liquid crystal light control material is used in the interior observation portion of the container. 4. The heat insulation box according to claim 1, wherein a reversible temperature indicating material is combined with a part of the container.